factor: fix whitespace at end of files.

basis/io/files/temp/windows/windows.factor

@@ -30,4 +30,3 @@ M: windows default-temp-directory
 
 M: windows default-cache-directory
     get-appdata-directory "factorcode.org\\Factor" append-path ;
-

basis/ui/pixel-formats/pixel-formats.factor

@@ -91,4 +91,3 @@ PRIVATE>
 GENERIC: world-pixel-format-attributes ( world -- attributes )
 
 GENERIC# check-world-pixel-format 1 ( world pixel-format -- )
-

extra/assocs/extras/extras.factor

@@ -51,4 +51,4 @@ ERROR: key-exists value key assoc ;
         key-exists
     ] [
         drop set-at
-    ] if ;
+    ] if ;